This article discusses the double-apsed churches (single-naved churches with two high altars) of Kythnos in the western Cyclades. The reasons for this uncommon configuration, although much debated, are not entirely clear. According to local tradition, during the period of Latin rule (thirteenth–seventeenth centuries) double-apsed churches were designed to accommodate both Orthodox and Catholic liturgies, or even some combination of the two. Combining information from written sources with architectural surveys at Oria Kastro, the island's ruined medieval capital, an attempt is made here to document Kythnos’ double-apsed churches and identify how these small provincial monuments reflect socio-religious conditions and inter-faith relations in the late medieval Aegean.
